I noticed that the BO's all have a value in Dilithium, I was wondering if they could be sold for this somehow?

no, but strangely enough you can kill off your doffs and get dilithium for them :\ weird.

I'd rather sell my my old ships for dilithium.

you cannot sell your bound BOffs

Yeah, that would be nice.

can sell ones you get from duty officer assignments to the bridge officer guy in space dock

tell him I Sent you

Only the Klingons kill dismissed DOFFs, which is strangely quicker way then the way to slow execution mission that does the same thing in principal.